Hidden-charm pentaquarks and their hidden-bottom and Bc -like partner states

Abstract

In the framework of the color-magnetic interaction, we have systematically studied the mass splittings of the possible hidden-charm pentaquarks qqqcc (q = u, d, s) where the three light quarks are in a color-octet state. We find that i) the LHCb Pc states fall in the mass region of the studied system; ii) most pentaquarks should be broad states since their S-wave open-charm decays are allowed while the lowest state is the J P = 1 2 − Λ-like pentaquark with probably the suppressed ηcΛ decay mode only; and iii) the J P = 5 2 − states do not decay through S-wave and their widths are not so broad. The masses and widths of the two LHCb Pc baryons are compatible with such pentaquark states. We also explore the hidden-bottom and Bc-like partners of the hidden-charm states and find the possible existence of the pentaquarks which are lower than the relevant hadronic molecules.

Exotic tetraquark states with the $$qq\bar{Q}\bar{Q}$$ q q Q ¯ Q ¯ configuration

“…This feature of narrow width for high-spin state is similar to the J = 5 2 pentaquark case which was studied in Ref. [63]. The lower 0 + T cc has only one S-wave decay channelDD while the higher one can also decay intoD * D * through S or D wave.…”

“…We will again adopt the framework of the simple color-magnetic interaction, although it is not a dynamical model. Recently, we have systematically applied it to tetraquark and pentaquark states in order to understand the nature of the observed exotic hadrons and to predict exotic phenomena [60][61][62][63]. Here, we calculate the mass splittings of the tetraquark states with the qqQQ configuration and estimate their mass spectrum, with which we further discuss their decay patterns.…”

Prediction of new states from D(*)B(*)Dias1, Roca2, Sakai3 2018Phys. Rev. D112110View full textAdd to dashboardCite

“…In the baryon sector remarkably special was the discovery of the pentaquark P c ð4450Þ þ by the LHCb collaboration [7]. Most of the non qq interpretations of many heavy flavor meson resonances lie within the picture of tetraquarks [5,[8][9][10] or mesonmeson molecules [6,[11][12][13][14][15][16][17][18]. Recently, several extensions to the heavy flavor sector in three-body systems like ρB ÃBÃ [19], ρD ÃDÃ [20,21], DKK (DKK) [22], and BDD (BDD) [23] have been carried out with the prediction of several resonant states.…”

Heavy quark spin multiplet structure of P¯(*)ΣQShimizu1, Yamaguchi2, Harada3 2018Phys. Rev. D142120View full textAdd to dashboardCite

“…In 2015, the Large Hadron Collider beauty experiment (LHCb) Collaboration announced the observation of two hidden-charm pentaquarks, P Before the LHCb observation, some theoretical studies of hidden-charm pentaquarks were done [4][5][6][7]. After the LHCb announcement, there were many analyses based on the hadronic molecular state [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], compact pentaquark state [25][26][27][28][29][30][31][32][33], quark-cluster model [34], baryocharmonium model [35], hadroquarkonia model [36], topologial soliton model [37], and meson-baryon molecules coupled with five-quark states [38]. The kinematical rescattering effects are also discussed in Refs.…”